On the applications side the TI OMAP is pretty interesting with the Gumstix and Beagleboard both being popular platforms for GNU/Linux based robots. One of the most interesting features is the built-in DSP, which is useful for computer vision tasks or just for accelerating gstreamer. This should be useful for encoding video telemetry data, until someone develops an ASIC or FPGA solution for encoding WebM. Another alternative to avoid composite video may be to wait for WirelessHD.